KR20060098878A - Cathode-ray tube display apparatus - Google Patents

Abstract

       The present invention relates to a cathode ray tube display device comprising a flyback transformer, the cathode ray tube display device of the present invention comprising: a vertical drive circuit for outputting a predetermined drive current; A vertical output unit for outputting a vertical pulse for determining a vertical scan period according to the input vertical drive current; A vertical deflection yoke for deflecting the vertical scan beam according to the vertical pulse output from the vertical output unit; The vertical pulse passing through the vertical deflection yoke and the horizontal pulse from the flyback transformer are generated to generate a correction signal, and the vertical output current is output from the vertical drive current using the drive signal output from the correction signal and the vertical drive circuit. It characterized in that it comprises a vertical distortion correction unit for outputting negative. As a result, even in a slim display device having a large deflection angle, it is possible to provide a cathode ray tube display device that can effectively prevent vertical distortion without stressing the peripheral IC.

Description

       Cathode ray tube display device {Cathode-Ray Tube Display Apparatus}

Figure 1 is a side cross-sectional view of a conventional CRT television,

2 is a vertical distortion correction circuit diagram of a conventional CRT television;

3 is an exemplary diagram of various pulses appearing in a process of correcting up and down distortion in a vertical distortion correction circuit diagram of a conventional CRT television according to FIG. 2;

4 is a vertical distortion correction circuit diagram of a CRT television according to the present invention;

5 is an exemplary diagram of various pulses appearing in a process of correcting up and down distortion in the up and down distortion correction circuit diagram of the CRT television of the present invention according to FIG. 4.

* Explanation of symbols for the main parts of the drawings

10: vertical drive circuit 20: vertical output unit

30: vertical distortion correction C3, C4: capacitor

R3, R4, R5: Resistance V-DY: Vertical Deflection Yoke

T2: Transformer

The present invention relates to a cathode ray tube display device, and more particularly, to a cathode ray tube display device that can effectively prevent vertical distortion without causing stress to a peripheral IC even in a slim display device having a large deflection angle.

Cathode-ray tube display device (hereinafter, described as CRT television, which is the most representative cathode ray tube display device), generates an electron beam by receiving an image signal from an external source, and generates the electron beam. Display the image by colliding with.

Referring to the CRT television in more detail, as shown in FIG. 1, the CRT television is largely composed of a neck 1, a funnel 2, and a panel 3. A lead 4 is formed at the rear end of the neck 1 to receive a bias according to an image signal, and an electron beam B is formed inside the neck 1 according to a bias applied through the lead 4. The electron gun 5 which generates and scans is mounted. Accordingly, in the CRT television, a dot or stripe in which the electron beam B scanned by the electron gun 5 is formed in a shadow mask 6 mounted inside the panel 3. These light beams collide with the phosphors of the fluorescent film 7 corresponding to the electron beam B to generate light to display an image.

As described above, the above-described CRT television has an up and down distortion in which lines are bent to one side from the upper side and the lower side of the displayed image screen due to the difference in the deflection angle caused by displaying the image by the electron beam B scanned by the electron gun 5. The phenomenon appears. In the related art, horizontal and vertical deflection yokes (H / V-DY) are mounted to the outside of the funnel 2 so that the electron beams scanned by the electron gun are applied to the magnetic fields generated by the horizontal and vertical deflection yokes (H / V-DY). By deflection, the above vertical distortion phenomenon was solved to some extent.

However, in the CRT television of the above structure, if vertical distortion occurs due to the difference in the structure of the cathode ray tube, it is difficult to solve the vertical distortion only by the horizontal and vertical deflection yoke (H / V-DY). 2 and 3, a conventional vertical distortion correction circuit for solving vertical distortion caused by a difference in structure of a cathode ray tube in a conventional CRT television will be described.

The vertical output circuit 9 receives a vertical drive current output from the vertical drive circuit 8 to generate a vertical pulse a (see 3-1 in FIG. 3), and generates a vertical pulse a to the transformer T1 of the vertical distortion correction circuit. Is authorized. Here, the vertical pulse b has a vertical moving section a-1 and a scanning section a-2. In addition, the transformer T1 of the vertical distortion correction circuit receives a horizontal pulse b (3-2 in FIG. 3) from a flyback transformer (not shown). Accordingly, the transformer T1 resonates with the capacitor C1 and integrates the horizontal pulse b, and overlaps the integrated sinusoidal horizontal pulse and the vertical pulse a so that the correction pulse c-1 overlaps the correction vertical. The pulse c (see 3-3 in Fig. 3) is output as the vertical deflection yoke (V-DY). Therefore, the distortion of the upper and lower sides generated in the video screen is corrected.

Recently, in order to solve the problem of the size that has been pointed out as a disadvantage with the development of electronic technology and multimedia, such a CRT television, the width (D) between the electron gun (5) and the panel (3) It is becoming a slim type of structure that narrows the gap. Therefore, in the CRT television of the slim type, the deflection angle of the electron beam B scanned by the electron gun 5 becomes larger than the conventional deflection angle in view of the CRT characteristic. Accordingly, in order to solve the vertical distortion of the screen in which the upper and lower sides of the screen become larger, the signal gain of the correction pulse c-1 overlapping the vertical pulse a must be increased.

However, the vertical distortion method of the conventional CRT television as described above directly superimposes an integrated sinusoidal horizontal pulse on the vertical pulse a, thereby correcting the correction pulse c-1 as shown in 3-4 of FIG. When the signal gain is increased by the pulse (c-2), not only the scan section (a-2) but also the vertical drive section (a-1) are affected so that an unnecessary ripple signal (d) is generated in the vertical drive section (a-1). Will occur. As a result, voltage stress is applied to the peripheral ICs, and the product cost is unnecessarily increased because ICs having high breakdown voltages are used to eliminate the voltage stress.

Accordingly, an object of the present invention is to provide a cathode ray tube display device capable of effectively preventing vertical distortion, without stressing the peripheral IC even in a slim display device having a large deflection angle.

The object is a cathode ray tube display device comprising a flyback transformer, comprising: a vertical drive circuit for outputting a predetermined drive current; A vertical output unit for outputting a vertical pulse for determining a vertical scan period according to the input vertical drive current; A vertical deflection yoke for deflecting the vertical scan beam according to the vertical pulse output from the vertical output unit; The vertical pulse passing through the vertical deflection yoke and the horizontal pulse from the flyback transformer are generated to generate a correction signal, and the vertical drive current using the drive signal output from the correction signal and the vertical drive circuit is outputted vertically. It is achieved by a cathode ray tube display device comprising a vertical distortion correction unit for outputting negatively.

The vertical distortion correction unit may include: a correction signal generation unit provided at a rear end of the vertical deflection yoke and outputting a correction signal by superposing a vertical pulse passing through the vertical deflection yoke and a horizontal pulse from the flyback transformer; And a feedback circuit unit for outputting the vertical drive current using the correction signal output from the correction signal generator and the drive current output from the vertical drive circuit to the vertical output unit.

In addition, the correction signal generation unit, the horizontal pulse output from the flyback transformer is applied to the primary side and the vertical pulse passing through the vertical deflection yoke is applied to the secondary side transformer for outputting the overlapping correction signal to the feedback circuit unit It is preferable to include.

Here, the feedback circuit unit feeds back the correction signal output from the correction signal generation unit, and outputs the vertical drive current obtained by combining the correction signal with the drive current output from the vertical drive circuit to the vertical output unit. It is preferable to include the including a signal line for.

Here, the horizontal pulse output from the flyback transformer is preferably an inverse pulse of a voltage corresponding to the third winding of the flyback transformer.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

4 is a vertical distortion correction circuit diagram of a CRT television according to the present invention. As shown in the figure, a CRT television according to the present invention is a flyback transformer (not shown) for supplying a stable DC voltage to a cathode ray tube (not shown), and a vertical drive circuit 10 for outputting a predetermined drive current. ), A vertical output unit 20 for outputting a vertical pulse for determining a vertical scan period according to the input vertical drive current, and a vertical biasing vertical scan beam according to a vertical pulse output from the vertical output unit 20. A correction signal is generated by superimposing a deflection yoke (V-DY), a vertical pulse passing through the vertical deflection yoke (V-DY) and a horizontal pulse from a flyback transformer (not shown), and generating the correction signal and the vertical drive circuit. And a vertical distortion correction unit 30 for outputting the vertical drive current using the drive current output from 10 to the vertical output unit 20.

The vertical output unit 20 receives a vertical drive current of a form in which the correction signal output from the vertical distortion correction unit 30 and the drive current output from the vertical drive circuit 10 are input, and the input vertical drive current is input. Outputs a vertical pulse to the vertical deflection yoke (V-DY) to determine the vertical scan period.

The vertical deflection yoke (V-DY) is a coil wound around a plurality of times. The vertical deflection yoke (V-DY) generates a magnetic field in accordance with the vertical pulse output from the vertical output section 20, and the vertical scanning beam scanned by the electron gun 5 (not shown). ) To solve the vertical distortion.

The vertical distortion correction unit 30 is provided at the rear end of the vertical deflection yoke V-DY, and overlaps the vertical pulse passing through the vertical deflection yoke V-DY with the horizontal pulse from the flyback transformer (not shown). The vertical output unit 20 outputs the vertical drive current using the transformer T2, which is a correction signal generator for outputting a correction signal, and the drive current output from the vertical drive circuit 10 and the correction signal output from the transformer T2. It includes a feedback signal line that is a feedback circuit to output.

The transformer T1 receives a horizontal pulse corresponding to the reverse pulse of the voltage from the tertiary winding of the flyback transformer (not shown) to the primary side and receives 2 vertical pulses passing through the vertical deflection yoke (V-DY). The correction signal is output by overlapping two pulses applied to the vehicle side and applied to the primary side and the secondary side. In this case, the horizontal pulse output from the tertiary winding of the flyback transformer (not shown) is preferably about 100V ~ 200V.

The feedback signal line feeds back the correction signal output from the transformer T1, and converts the vertical drive current into which the correction signal is combined with the drive current output from the vertical drive circuit 10. Will output

The process of correcting up and down distortion in the CRT television of the present invention having the up and down distortion correction circuit having the above-described configuration will be described with reference to various pulses appearing in the process of correcting the up and down distortion in FIG.

First, in the initial stage of driving, only a predetermined drive current output from the vertical drive circuit 10 is input to the vertical output unit 20. The vertical output unit 20 outputs the vertical pulse a as shown in 3-1 of FIG. Accordingly, the vertical deflection yoke V-DY does not generate a magnetic field to sufficiently correct vertical distortion. Thereafter, a vertical pulse c 'having a triangular waveform shape (see 5-2 in FIG. 5) passing through the vertical deflection yoke V-DY is applied to the transformer T2. Here, the transformer T2 receives the horizontal pulse b (see 3-2 in FIG. 3) output from the flyback transformer (not shown) to the primary side, and resonates with the capacitor C4 to resonate with the horizontal pulse b. Integrate to convert to a sinusoidal shape similar to the parabola form. Accordingly, the transformer T2 superimposes the vertical pulse c 'applied to the secondary side and the horizontal pulse converted into the sinusoidal waveform to correct the correction signal d' (see 5-3 in Fig. 5). Generate and print. Thereafter, the correction signal d 'is combined with the predetermined drive current output from the vertical drive circuit 10 through a feedback signal line and input to the vertical output unit 20. Accordingly, the vertical output unit 20 receives a vertical drive current obtained by combining the correction signal d 'and the predetermined drive current. The vertical output unit 20 generates a vertical pulse a '(see 5-1 in FIG. 5) having a correction pulse d "which is an element of the correction signal d' according to the input vertical drive current. Output to deflection yoke (V-DY).

That is, by inputting a vertical drive current obtained by synthesizing the correction signal d 'to the vertical output unit 20 to generate a correction pulse d "when generating a vertical pulse in the vertical output unit 20, a signal gain is obtained. In reflecting this larger correction signal d ', the correction pulse d "can be applied only to the scan section a'-2 without affecting the vertical dynamic section a'-1.

Accordingly, the vertical deflection yoke V-DY solves the vertical distortion by generating a magnetic field for sufficiently correcting the vertical distortion having a large deflection angle by the vertical pulse a 'output from the vertical output unit 20. . The above-described up and down distortion correction process is repeated by the feedback signal line which feeds back the transformer T2 and the correction signal d 'output from the transformer T2, and the up and down distortion of the video screen while the CRT television is driven. The phenomenon is solved.

Accordingly, the CRT display device of the present invention having the above-described configuration does not directly overlap the horizontal pulse component with the vertical pulse a, so that even if the signal gain of the correction signal d 'is increased, the vertical driving mechanism a The influence of the correction pulse d " may not be influenced by “-1.” Also, a horizontal pulse having a low voltage size of approximately 100 V to 200 V is used as a horizontal pulse component for generating the correction signal d '. Therefore, it is possible to solve the temperature rise and various stresses of the peripheral IC compared to using a high voltage.

As described above, according to the present invention, it is possible to provide a cathode ray tube display device capable of effectively preventing vertical distortion, without stressing the peripheral IC even in a slim display device having a large deflection angle.

Claims (5)

In the cathode ray tube display device comprising a flyback transformer, A vertical drive circuit for outputting a predetermined drive current; A vertical output unit for outputting a vertical pulse for determining a vertical scan period according to the input vertical drive current; A vertical deflection yoke for deflecting the vertical scan beam according to the vertical pulse output from the vertical output unit; The vertical pulse passing through the vertical deflection yoke and the horizontal pulse from the flyback transformer are generated to generate a correction signal, and the vertical output current is output from the vertical drive current using the drive signal output from the correction signal and the vertical drive circuit. Cathode ray tube display device comprising a vertical distortion correction unit for outputting negative. The method of claim 1, The vertical distortion correction, A correction signal generator provided at a rear end of the vertical deflection yoke and outputting a correction signal by superimposing a vertical pulse passing through the vertical deflection yoke and a horizontal pulse from the flyback transformer; And a feedback circuit unit configured to output the vertical drive current using the correction signal output from the correction signal generator and the drive current output from the vertical drive circuit to the vertical output unit. The method of claim 2, The correction signal generator, And a transformer for applying a horizontal pulse output from the flyback transformer to the primary side and a vertical pulse passing through the vertical deflection yoke to the secondary side to output an overlapping correction signal to the feedback circuit unit. Tube display. The method of claim 2 or 3, The feedback circuit unit, And a signal line for feeding back the correction signal outputted from the correction signal generator and outputting the vertical drive current obtained by combining the correction signal to the drive current output from the vertical drive circuit to the vertical output unit. Cathode ray tube display device characterized in that. The method of claim 4, wherein And a horizontal pulse output from the flyback transformer is a reverse pulse of a voltage corresponding to a third winding of the flyback transformer.

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